Title :
A superconductive shielding can for high Tc SQUID
Author :
Cui, G.J. ; Wang, S.G. ; Jiang, H.M. ; Li, J.Z. ; Li, C.Y. ; Lin, C.D. ; Liu, R.Z. ; Zheng, Q.L. ; Fu, Y.S. ; Luo, Z.L. ; Qiao, W.C.
Author_Institution :
Dept. of Phys., Peking Univ., Beijing, China
fDate :
3/1/1989 12:00:00 AM
Abstract :
The authors have fabricated yttrium-barium-copper-oxygen ceramic superconductive shielding cans and measured the magnetic shielding properties at liquid-nitrogen temperature by using a Hall magnetic sensor and high-Tc SQUID (superconducting quantum interference device). They report the fabrication processing of the shielding cans and the measurement results. The magnetic properties of the bulk samples are very different from those of conventional superconductors. There are lots of grain boundaries and defects inside the ceramic samples. The magnetic field can penetrate through those defects into the sample easily. The physical density of the samples is of great importance for their superconductive magnetic shielding ability. The isostatic pressing technique, which has been used in this work to prepare a dense and uniform cylinder, is a key processing method
Keywords :
SQUIDs; barium compounds; ceramics; crystal defects; density of solids; grain boundaries; high-temperature superconductors; magnetic shielding; materials preparation; yttrium compounds; 77 K; Hall magnetic sensor; YBa2Cu3O7; ceramic superconductive shielding cans; defects; density; fabrication processing; grain boundaries; high Tc SQUID; high temperature superconductors; isostatic pressing technique; magnetic shielding properties; superconductive shielding; Ceramics; Magnetic field measurement; Magnetic liquids; Magnetic properties; Magnetic sensors; Magnetic shielding; SQUIDs; Superconductivity; Temperature sensors; Yttrium;
Journal_Title :
Magnetics, IEEE Transactions on
